Support all the bucket properties. Needed for basho/riak_test#226.
Fix error/bug with repl bucket property.

* 'off' is not a valid value
* 'true' and 'both' are equivalent, but 'true' is
  backwards-compatible, so we should prefer that.
Fix typo dw -> pr.
Merge pull request #13 from basho/sdc-bucket-props

Support all the bucket properties. Needed for basho/riak_test#226.